In the construction of rock wool board, polyurethane adhesive is a two-component polyurethane adhesive. Polyurethane adhesive (PU adhesive) is an adhesive containing carbamate group (- nhcoo -) or isocyanate group (- NCO) in the molecular chain, which is prepared by the reaction of isocyanate with hydroxyl containing compounds such as polyester, polyether, castor oil or other polyols. It has excellent performance, strong molecular designability, wide physical properties, wide range of adhesive applications, and is one of the important varieties of synthetic adhesives.
Two component polyurethane adhesive is a kind of Pu product with many varieties, large amount and wide application. The two components of the product are packaged separately, easy to store, adjustable performance, high adhesion strength, wide application range, good weather resistance and other characteristics, showing unique advantages in the application field.
Polyurethane adhesives are mainly divided into two categories: polyisocyanate and polyurethane. According to the way of use, polyurethane adhesives can be divided into single component and two-component. The isocyanate group and the urethane group have strong polarity and chemical activity, so they have good chemical bonding ability to porous materials (leather, foam, etc.) and surface polished materials (glass, metal, etc.).
Moreover, polyurethane adhesive has many advantages, such as good flexibility, good vibration resistance, impact resistance, wear resistance, high bond strength and so on. Two component polyurethane adhesives can be divided into solvent type and solvent-free type.
Solvent based polyurethane adhesive technology is mature, but the volatilization of organic solvents not only wastes resources, but also threatens the environment and production safety. Solvent free polyurethane adhesive has obvious advantages
1、 No solvent volatilization, completely used;
2、 It is an energy-saving and emission reduction technology without solvent removal by drying channel;
3、 High production efficiency, suitable for automatic production line. Solvent free two-component polyurethane (PU) adhesive has the advantages of good bonding effect, adjustable hard and soft, stable storage and solvent-free volatilization, which is an important research direction of PU adhesive industry.